It sounds like the Deployment Server is being told to check in with itself. From what I understand the DS cannot also be a Deployment Client (under the same instance). I would suggest you check /SplunkPath/etc/system/local/deploymentclient.conf or check if you have a deployment client app.
Remove the offending deploymentclient.conf/app and then in your serverclass.conf put your DS on the blacklist.
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